CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 1,314	$ 4,022
OTHER COMPREHENSIVE INCOME, NET OF TAX:
Unrealized gain on available-for-sale securities, net of tax of $8 and $15, respectively	14	28
Employee benefit plan:
Amortization of prior service cost and actuarial loss for retirement plan included in net periodic pension costs, net of tax of $87 and $52, respectively	156	94
Net change for employee benefit plan	156	94
TOTAL OTHER COMPREHENSIVE INCOME	170	122
COMPREHENSIVE INCOME	1,484	4,144
Unrealized gain (loss) on available-for-sale securities, tax	8	15
Amortization of prior service cost and actuarial loss for retirement plan included in net periodic pension costs, tax	$ 87	$ 52